This stunning wallpaper shows Grand Canyon National Park in Arizona. A powerful and inspiring landscape, the Grand Canyon overwhelms our senses through its immense size: 277 river miles (446km) long, up to 18 miles (29km) wide, and a mile (1.6km) deep.
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People of numerous pre-Columbian civilizations in northern Chile, including the Incas and the Chinchorro culture, suffered from chronic arsenic poisoning due to their consumption of contaminated water, new research suggests.
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